小型泡沫沥青混合料搅拌设备的结构设计与参数优化

发布时间：2018-05-12 02:04

本文选题：泡沫沥青 + 双轴卧式搅拌设备　；参考：《内蒙古工业大学》2014年硕士论文

【摘要】：搅拌设备是一种应用相当广泛的工程机械。在各类搅拌设备当中，沥青混合料的搅拌设备主要以强制双轴卧式搅拌设备为主。随着泡沫沥青发泡技术的不断成熟，以及其较普通沥青与集料拌合的高技术性，因而对强制双轴卧式搅拌设备的内部结构进行优化，对提高泡沫沥青混合料拌合的技术水平有着极其重要的意义。双轴卧式搅拌设备内部的物料流动是十分复杂的非定常湍流流动，它的各项流动性能都直接与内部流场密切相关。通过搅拌设备的内部结构设计，三维建模，CFD软件分析，从而解析搅拌设备内部流场，优化内部流场结构，可最终提高双轴卧式搅拌设备的设计水平。本文首先根据泡沫沥青的物理特性、泡沫沥青混合料级配以及实验工作要求，确定了搅拌设备为强制间歇式双轴卧式搅拌设备。根据双轴卧式搅拌设备影响拌和性能的结构形式参数，使用三维建模软件UG建立三维模型。应用流体力学分析软件Fluent的前处理软件Gambit建立网格数递增的六面体网格，从而确定了兼顾计算精度和效率的合适的网格规模。基于并行Fluent的欧拉多相流模型和动网格UDF模型，通过改变搅拌轴转动位置进行一系列的非稳态湍流计算。通过结果对比分析，研究湍流模型中叶轮转动过程其几何形状对计算结果的影响，找到各计算结果中结构之间的关系，为利用CFD技术开发新的高效的双轴卧式搅拌设备打下基础。在对比分析中，分别设计了双轴搅拌臂正正、正反、反反三种排列形式和叶片安装角为45°和60°两种安装角度。实验结果表明，叶片正正装，搅拌叶片的安装角度为45°，搅拌臂排列方式为围流，两轴搅拌臂交错布置，，单轴搅拌臂相位为90°可以较好地提高双轴卧式搅拌设备的效果。该方法实现了有效利用湍流方程来控制边界层的围流运动形态，进而为提高搅拌效果提供了设计依据，对双轴卧式搅拌设备的设计理论具有积极意义。
[Abstract]:Mixing equipment is a kind of widely used construction machinery. Among all kinds of mixing equipment, the mixing equipment of asphalt mixture is mainly forced two-axis horizontal mixing equipment. With the maturation of foaming technology of foamed asphalt and its high technology compared with ordinary asphalt and aggregate, the internal structure of forced biaxial horizontal mixing equipment is optimized. It is of great significance to improve the technical level of mixing foamed asphalt mixture. The material flow in a biaxial horizontal mixing plant is a very complicated unsteady turbulent flow, and its flow performance is closely related to the internal flow field. Through the design of the internal structure of the mixing equipment and the analysis of the CFD software, the internal flow field of the mixing equipment is analyzed and the internal flow field structure is optimized, which can eventually improve the design level of the two-axis horizontal mixing equipment. Firstly, according to the physical characteristics of foamed asphalt, the gradation of foamed asphalt mixture and the requirements of experimental work, this paper determines that the mixing equipment is a forced intermittent biaxial horizontal mixing equipment. According to the structural parameters of the biaxial horizontal mixing equipment which affects the mixing performance, the 3D modeling software UG is used to build the 3D model. The hexahedron mesh with increasing number of meshes is established by using the pre-processing software Gambit of the hydrodynamic analysis software Fluent, which determines the appropriate mesh size which takes into account the calculation accuracy and efficiency. Based on the Euler multiphase flow model and the dynamic grid UDF model of parallel Fluent, a series of unsteady turbulence calculations are carried out by changing the rotating position of the stirring axis. Through comparative analysis of the results, the influence of the geometry of the impeller rotation process on the calculation results in the turbulent model is studied, and the relationship between the structures in the calculation results is found. It lays a foundation for the development of a new high-efficiency two-axis horizontal mixing equipment using CFD technology. In the comparison and analysis, the forward, reverse and backward arrangement of the two-axis stirring arm are designed, respectively, and the installation angles of the blade are 45 掳and 60 掳respectively. The experimental results show that the installation angle of the blade is 45 掳, the arrangement of the mixing arm is circumfluence, the two-axis mixing arm is staggered and the phase of the single-axis stirring arm is 90 掳, the effect of the two-axis horizontal mixing equipment can be improved better. The method realizes the effective use of turbulence equations to control the flow pattern of the boundary layer and provides the design basis for improving the mixing effect. It is of positive significance to the design theory of the two-axis horizontal mixing equipment.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U415.522

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